266704261 has 4 divisors (see below), whose sum is σ = 271076524. Its totient is φ = 262332000.

The previous prime is 266704231. The next prime is 266704301. The reversal of 266704261 is 162407662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162407662 = 2 ⋅81203831.

It can be written as a sum of positive squares in 2 ways, for example, as 90611361 + 176092900 = 9519^2 + 13270^2 .

It is a cyclic number.

It is not a de Polignac number, because 266704261 - 2²⁷ = 132486533 is a prime.

It is a super-2 number, since 2×266704261² = 142262325671112242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266704231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2186040 + ... + 2186161.

It is an arithmetic number, because the mean of its divisors is an integer number (67769131).

Almost surely, 2^266704261 is an apocalyptic number.

It is an amenable number.

266704261 is a deficient number, since it is larger than the sum of its proper divisors (4372263).

266704261 is an equidigital number, since it uses as much as digits as its factorization.

266704261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372262.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 266704261 is about 16331.0826646613. The cubic root of 266704261 is about 643.6898357572.

The spelling of 266704261 in words is "two hundred sixty-six million, seven hundred four thousand, two hundred sixty-one".